%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[TcModule]{Typechecking a whole module}
\begin{code}
module TcModule (
typecheckModule,
- TcResults,
- TcDDumpDeriv
+ TcResults(..)
) where
#include "HsVersions.h"
-import CmdLineOpts ( opt_D_dump_tc, opt_D_dump_deriv )
+import CmdLineOpts ( opt_D_dump_tc )
import HsSyn ( HsModule(..), HsBinds(..), MonoBinds(..), HsDecl(..) )
-import RnHsSyn ( RenamedHsModule, RenamedFixityDecl(..) )
-import TcHsSyn ( TypecheckedHsBinds, TypecheckedHsExpr,
- TypecheckedDictBinds, TcMonoBinds,
- TypecheckedMonoBinds,
- zonkTopBinds )
+import RnHsSyn ( RenamedHsModule )
+import TcHsSyn ( TcMonoBinds, TypecheckedMonoBinds,
+ TypecheckedForeignDecl, TypecheckedRuleDecl,
+ zonkTopBinds, zonkForeignExports, zonkRules
+ )
import TcMonad
import Inst ( Inst, emptyLIE, plusLIE )
import TcBinds ( tcTopBindsAndThen )
import TcClassDcl ( tcClassDecls2 )
import TcDefaults ( tcDefaults )
-import TcEnv ( TcIdOcc(..), tcExtendGlobalValEnv, tcExtendTyConEnv, getEnv_LocalIds,
- getEnv_TyCons, getEnv_Classes, tcLookupLocalValue,
- tcLookupLocalValueByKey, tcLookupTyCon,
- tcLookupGlobalValueByKeyMaybe )
+import TcEnv ( tcExtendGlobalValEnv, tcExtendTypeEnv,
+ getEnvTyCons, getEnvClasses, tcLookupValueMaybe,
+ explicitLookupValueByKey, tcSetValueEnv,
+ tcLookupTyCon, initEnv,
+ ValueEnv, TcTyThing(..)
+ )
import TcExpr ( tcId )
+import TcRules ( tcRules )
+import TcForeign ( tcForeignImports, tcForeignExports )
import TcIfaceSig ( tcInterfaceSigs )
import TcInstDcls ( tcInstDecls1, tcInstDecls2 )
import TcInstUtil ( buildInstanceEnvs, classDataCon, InstInfo )
import TcSimplify ( tcSimplifyTop )
-import TcTyClsDecls ( tcTyAndClassDecls1 )
+import TcTyClsDecls ( tcTyAndClassDecls )
import TcTyDecls ( mkDataBinds )
-import TcType ( TcType, tcInstType )
-import TcKind ( TcKind, kindToTcKind )
+import TcType ( TcType, typeToTcType,
+ TcKind, kindToTcKind,
+ newTyVarTy
+ )
-import RnMonad ( RnNameSupply(..) )
+import RnMonad ( RnNameSupply, getIfaceFixities, Fixities, InterfaceDetails )
import Bag ( isEmptyBag )
-import ErrUtils ( WarnMsg, ErrMsg,
- pprBagOfErrors, dumpIfSet, ghcExit
- )
-import Id ( idType, GenId, IdEnv, nullIdEnv )
-import Maybes ( catMaybes, MaybeErr(..) )
-import Name ( Name, isLocallyDefined, pprModule, NamedThing(..) )
-import TyCon ( TyCon, isSynTyCon, tyConKind )
+import ErrUtils ( Message, printErrorsAndWarnings, dumpIfSet )
+import Id ( Id, idType )
+import Module ( pprModuleName )
+import Name ( Name, nameUnique, isLocallyDefined, NamedThing(..) )
+import TyCon ( TyCon, tyConKind )
+import DataCon ( dataConId )
import Class ( Class, classSelIds, classTyCon )
-import Type ( mkTyConApp, mkSynTy, Type )
-import TyVar ( emptyTyVarEnv )
+import Type ( mkTyConApp, mkForAllTy,
+ boxedTypeKind, getTyVar, Type )
import TysWiredIn ( unitTy )
-import PrelMods ( gHC_MAIN, mAIN )
-import PrelInfo ( main_NAME, ioTyCon_NAME )
-import Unify ( unifyTauTy )
-import UniqFM ( lookupUFM_Directly, lookupWithDefaultUFM_Directly,
- filterUFM, eltsUFM )
+import PrelMods ( mAIN_Name )
+import PrelInfo ( main_NAME, thinAirIdNames, setThinAirIds )
+import TcUnify ( unifyTauTy )
import Unique ( Unique )
import UniqSupply ( UniqSupply )
+import Maybes ( maybeToBool )
import Util
import Bag ( Bag, isEmptyBag )
-import FiniteMap ( emptyFM, FiniteMap )
import Outputable
+
+import IOExts
\end{code}
Outside-world interface:
\begin{code}
-- Convenient type synonyms first:
-type TcResults
- = (TypecheckedMonoBinds,
- [TyCon], [Class],
- Bag InstInfo, -- Instance declaration information
- TcDDumpDeriv)
-
-type TcDDumpDeriv = SDoc
+data TcResults
+ = TcResults {
+ tc_binds :: TypecheckedMonoBinds,
+ tc_tycons :: [TyCon],
+ tc_classes :: [Class],
+ tc_insts :: Bag InstInfo, -- Instance declaration information
+ tc_fords :: [TypecheckedForeignDecl], -- Foreign import & exports.
+ tc_rules :: [TypecheckedRuleDecl], -- Transformation rules
+ tc_env :: ValueEnv,
+ tc_thinair :: [Id] -- The thin-air Ids
+ }
---------------
typecheckModule
:: UniqSupply
-> RnNameSupply
+ -> InterfaceDetails
-> RenamedHsModule
-> IO (Maybe TcResults)
-typecheckModule us rn_name_supply mod
- = let
- (maybe_result, warns, errs) = initTc us (tcModule rn_name_supply mod)
- in
- print_errs warns >>
- print_errs errs >>
+typecheckModule us rn_name_supply iface_det mod
+ = initTc us initEnv (tcModule rn_name_supply (getIfaceFixities iface_det) mod)
+ >>= \ (maybe_result, warns, errs) ->
+
+ printErrorsAndWarnings errs warns >>
- dumpIfSet opt_D_dump_tc "Typechecked"
- (case maybe_result of
- Just (binds, _, _, _, _) -> ppr binds
- Nothing -> text "Typecheck failed") >>
+ -- write the thin-air Id map
+ (case maybe_result of
+ Just results -> setThinAirIds (tc_thinair results)
+ Nothing -> return ()
+ ) >>
- dumpIfSet opt_D_dump_deriv "Derived instances"
+ dumpIfSet opt_D_dump_tc "Typechecked"
(case maybe_result of
- Just (_, _, _, _, dump_deriv) -> dump_deriv
- Nothing -> empty) >>
+ Just results -> ppr (tc_binds results)
+ $$
+ pp_rules (tc_rules results)
+ Nothing -> text "Typecheck failed") >>
return (if isEmptyBag errs then
maybe_result
else
Nothing)
-print_errs errs
- | isEmptyBag errs = return ()
- | otherwise = printErrs (pprBagOfErrors errs)
+pp_rules [] = empty
+pp_rules rs = vcat [ptext SLIT("{-# RULES"),
+ nest 4 (vcat (map ppr rs)),
+ ptext SLIT("#-}")]
\end{code}
The internal monster:
\begin{code}
tcModule :: RnNameSupply -- for renaming derivings
+ -> Fixities -- needed for Show/Read derivings.
-> RenamedHsModule -- input
-> TcM s TcResults -- output
-tcModule rn_name_supply
- (HsModule mod_name verion exports imports fixities decls src_loc)
+tcModule rn_name_supply fixities
+ (HsModule mod_name verion exports imports decls _ src_loc)
= tcAddSrcLoc src_loc $ -- record where we're starting
fixTc (\ ~(unf_env ,_) ->
-- which is done lazily [ie failure just drops the pragma
-- without having any global-failure effect].
--
- -- unf_env is also used to get the pragam info for dfuns.
+ -- unf_env is also used to get the pragam info
+ -- for imported dfuns and default methods
-- The knot for instance information. This isn't used at all
-- till we type-check value declarations
- fixTc ( \ ~(rec_inst_mapper, _, _, _, _) ->
+ fixTc ( \ ~(rec_inst_mapper, _, _, _) ->
-- Type-check the type and class decls
- -- trace "tcTyAndClassDecls:" $
- tcTyAndClassDecls1 unf_env rec_inst_mapper decls `thenTc` \ env ->
+ tcTyAndClassDecls unf_env rec_inst_mapper decls `thenTc` \ env ->
- -- trace "tc3" $
-- Typecheck the instance decls, includes deriving
tcSetEnv env (
- -- trace "tcInstDecls:" $
- tcInstDecls1 unf_env decls mod_name rn_name_supply
- ) `thenTc` \ (inst_info, deriv_binds, ddump_deriv) ->
+ tcInstDecls1 unf_env decls mod_name fixities rn_name_supply
+ ) `thenTc` \ (inst_info, deriv_binds) ->
- -- trace "tc4" $
buildInstanceEnvs inst_info `thenNF_Tc` \ inst_mapper ->
- returnTc (inst_mapper, env, inst_info, deriv_binds, ddump_deriv)
+ returnTc (inst_mapper, env, inst_info, deriv_binds)
-- End of inner fix loop
- ) `thenTc` \ (_, env, inst_info, deriv_binds, ddump_deriv) ->
+ ) `thenTc` \ (_, env, inst_info, deriv_binds) ->
- -- trace "tc5" $
- tcSetEnv env $
+ tcSetEnv env (
-- Default declarations
tcDefaults decls `thenTc` \ defaulting_tys ->
-- Create any necessary record selector Ids and their bindings
-- "Necessary" includes data and newtype declarations
+ -- We don't create bindings for dictionary constructors;
+ -- they are always fully applied, and the bindings are just there
+ -- to support partial applications
let
- tycons = getEnv_TyCons env
- classes = getEnv_Classes env
+ tycons = getEnvTyCons env
+ classes = getEnvClasses env
local_tycons = filter isLocallyDefined tycons
local_classes = filter isLocallyDefined classes
in
-- (a) constructors
-- (b) record selectors
-- (c) class op selectors
- -- (d) default-method ids
+ -- (d) default-method ids... where? I can't see where these are
+ -- put into the envt, and I'm worried that the zonking phase
+ -- will find they aren't there and complain.
tcExtendGlobalValEnv data_ids $
tcExtendGlobalValEnv (concat (map classSelIds classes)) $
-- the classes, and the global value environment with the
-- corresponding data cons.
-- They are mentioned in types in interface files.
- tcExtendGlobalValEnv (map classDataCon classes) $
- tcExtendTyConEnv [ (getName tycon, (kindToTcKind (tyConKind tycon), Nothing, tycon))
- | clas <- classes,
- let tycon = classTyCon clas
- ] $
+ tcExtendGlobalValEnv (map (dataConId . classDataCon) classes) $
+ tcExtendTypeEnv [ (getName tycon, (kindToTcKind (tyConKind tycon), Nothing, ATyCon tycon))
+ | clas <- classes,
+ let tycon = classTyCon clas
+ ] $
-- Interface type signatures
-- We tie a knot so that the Ids read out of interfaces are in scope
tcInterfaceSigs unf_env decls `thenTc` \ sig_ids ->
tcExtendGlobalValEnv sig_ids $
+ -- foreign import declarations next.
+ tcForeignImports decls `thenTc` \ (fo_ids, foi_decls) ->
+ tcExtendGlobalValEnv fo_ids $
-- Value declarations next.
-- We also typecheck any extra binds that came out of the "deriving" process
- -- trace "tcBinds:" $
tcTopBindsAndThen
(\ is_rec binds1 (binds2, thing) -> (binds1 `AndMonoBinds` binds2, thing))
(get_val_decls decls `ThenBinds` deriv_binds)
- ( tcGetEnv `thenNF_Tc` \ env ->
+ ( tcGetEnv `thenNF_Tc` \ env ->
+ tcGetUnique `thenNF_Tc` \ uniq ->
returnTc ((EmptyMonoBinds, env), emptyLIE)
) `thenTc` \ ((val_binds, final_env), lie_valdecls) ->
tcSetEnv final_env $
+ -- foreign export declarations next.
+ tcForeignExports decls `thenTc` \ (lie_fodecls, foe_binds, foe_decls) ->
-- Second pass over class and instance declarations,
-- to compile the bindings themselves.
- -- trace "tc8" $
tcInstDecls2 inst_info `thenNF_Tc` \ (lie_instdecls, inst_binds) ->
tcClassDecls2 decls `thenNF_Tc` \ (lie_clasdecls, cls_binds) ->
+ tcRules decls `thenNF_Tc` \ (lie_rules, rules) ->
-
- -- Check that "main" has the right signature
- tcCheckMainSig mod_name `thenTc_`
-
-- Deal with constant or ambiguous InstIds. How could
-- there be ambiguous ones? They can only arise if a
-- top-level decl falls under the monomorphism
-- restriction, and no subsequent decl instantiates its
-- type. (Usually, ambiguous type variables are resolved
-- during the generalisation step.)
- -- trace "tc9" $
let
- lie_alldecls = lie_valdecls `plusLIE` lie_instdecls `plusLIE` lie_clasdecls
+ lie_alldecls = lie_valdecls `plusLIE`
+ lie_instdecls `plusLIE`
+ lie_clasdecls `plusLIE`
+ lie_fodecls `plusLIE`
+ lie_rules
in
tcSimplifyTop lie_alldecls `thenTc` \ const_inst_binds ->
+ -- Check that Main defines main
+ (if mod_name == mAIN_Name then
+ tcLookupValueMaybe main_NAME `thenNF_Tc` \ maybe_main ->
+ checkTc (maybeToBool maybe_main) noMainErr
+ else
+ returnTc ()
+ ) `thenTc_`
-- Backsubstitution. This must be done last.
- -- Even tcCheckMainSig and tcSimplifyTop may do some unification.
+ -- Even tcSimplifyTop may do some unification.
let
all_binds = data_binds `AndMonoBinds`
val_binds `AndMonoBinds`
inst_binds `AndMonoBinds`
cls_binds `AndMonoBinds`
- const_inst_binds
+ const_inst_binds `AndMonoBinds`
+ foe_binds
in
- zonkTopBinds all_binds `thenNF_Tc` \ (all_binds', really_final_env) ->
+ zonkTopBinds all_binds `thenNF_Tc` \ (all_binds', really_final_env) ->
+ tcSetValueEnv really_final_env $
+ zonkForeignExports foe_decls `thenNF_Tc` \ foe_decls' ->
+ zonkRules rules `thenNF_Tc` \ rules' ->
+ let
+ thin_air_ids = map (explicitLookupValueByKey really_final_env . nameUnique) thinAirIdNames
+ -- When looking up the thin-air names we must use
+ -- a global env that includes the zonked locally-defined Ids too
+ -- Hence using really_final_env
+ in
returnTc (really_final_env,
- (all_binds', local_tycons, local_classes, inst_info, ddump_deriv))
+ (TcResults { tc_binds = all_binds',
+ tc_tycons = local_tycons,
+ tc_classes = local_classes,
+ tc_insts = inst_info,
+ tc_fords = foi_decls ++ foe_decls',
+ tc_rules = rules',
+ tc_env = really_final_env,
+ tc_thinair = thin_air_ids
+ }))
+ )
-- End of outer fix loop
) `thenTc` \ (final_env, stuff) ->
\begin{code}
-tcCheckMainSig mod_name
- | mod_name /= mAIN
- = returnTc () -- A non-main module
-
- | otherwise
- = -- Check that main is defined
- tcLookupTyCon ioTyCon_NAME `thenTc` \ (_,_,ioTyCon) ->
- tcLookupLocalValue main_NAME `thenNF_Tc` \ maybe_main_id ->
- case maybe_main_id of {
- Nothing -> failWithTc noMainErr ;
- Just main_id ->
-
- -- Check that it has the right type (or a more general one)
- let
- expected_ty = mkTyConApp ioTyCon [unitTy]
- in
- tcInstType emptyTyVarEnv expected_ty `thenNF_Tc` \ expected_tau ->
- tcId main_NAME `thenNF_Tc` \ (_, lie, main_tau) ->
- tcSetErrCtxt mainTyCheckCtxt $
- unifyTauTy expected_tau
- main_tau `thenTc_`
- checkTc (isEmptyBag lie) (mainTyMisMatch expected_ty (idType main_id))
- }
-
-
-mainTyCheckCtxt
- = hsep [ptext SLIT("When checking that"), ppr main_NAME, ptext SLIT("has the required type")]
-
noMainErr
- = hsep [ptext SLIT("Module"), quotes (pprModule mAIN),
+ = hsep [ptext SLIT("Module"), quotes (pprModuleName mAIN_Name),
ptext SLIT("must include a definition for"), quotes (ppr main_NAME)]
-
-mainTyMisMatch :: Type -> TcType s -> ErrMsg
-mainTyMisMatch expected actual
- = hang (hsep [ppr main_NAME, ptext SLIT("has the wrong type")])
- 4 (vcat [
- hsep [ptext SLIT("Expected:"), ppr expected],
- hsep [ptext SLIT("Inferred:"), ppr actual]
- ])
\end{code}
+
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